/*
  将下面异步代码使用 Promise 的方法改进
  尽量用看上去像同步代码的方式
  setTimeout(function () {
    var a = 'hello'
    setTimeout(function () {
      var b = 'lagou'
      setTimeout(function () {
        var c = 'I ♥ U'
        console.log(a + b +c)
      }, 10)
    }, 10)
  }, 10)
*/

let p = new Promise((resolve, reject) => {
    var a = "hello"
    resolve(a)
})

p.then((a) => {
    var b = "lagou"
    return a + b
}).then((d) => {
    var c = 'I ♥ U'
    console.log(d + c)
})